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Painting aluminum

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james

01-28-2002 13:38:22




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I need to paint some aluminum hydraulic levers. Everything was sandblasted and degreased with laquer thinner. Do I need a special etching primer? what type of paint can I use? I am using acrylic enamel paint with hardener.




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charles ethridge

01-29-2002 16:11:29




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 Re: painting aluminum in reply to james, 01-28-2002 13:38:22  
james , you have got some very good advice, i have used the alunmprep and ailiodn and both work well. I have painted a lot of airplanes and i all ways used a paint called alunmigrip, look up sportys pilot shop and you can order this from them. this paint is made for alumninm and it works.



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Rod (NH)

01-28-2002 18:17:54




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 Re: painting aluminum in reply to james, 01-28-2002 13:38:22  
For best adhesion I would suggest you prep aluminum with "Alumiprep 33", PPG #DX533 and associated conversion coating "Alodine 1001", PPG #DX501. I believe DuPont also has equivalents. An acrylic enamel with hardener is an excellent choice for topcoat...however, the isocyanates in the hardener are bad news for your respiratory system.

Rod



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Wayne (Ont)

01-28-2002 20:33:22




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 Re: Re: painting aluminum in reply to Rod (NH), 01-28-2002 18:17:54  
An additional note on isocyanates. No mask or filter that I am aware of removes them. A respirator with its own air supply is a must.
I found out the hard way. Started to have night time breathing problems similar to asthma.There is nothing more frightening than not being able to get your breath. (Slows down your project too if you stop breathing completely). Fortunately the symtoms have gone away.

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Rod (NH)

01-28-2002 21:25:11




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 Re: Re: Re: painting aluminum in reply to Wayne (Ont), 01-28-2002 20:33:22  
Agree completely Wayne. I also learned the hard way about 15 yrs ago. I then invested in a supplied air, full face respirator that provides fresh, uncontaminated air directly to the mask. It really is the ONLY way to safely spray isocyanate-containing materials. The other option is to avoid adding the hardener. An acrylic enamel system is still very good even without the hardener. Unless you need the added chemical resistance or need the ability to color sand or rub the final product or are concerned about recoating after the sensitive period begins, forget the hardener...especially if you do not have the equipment to safely spray it. I believe the current official safety recommendations are not even to MIX the stuff without supplied air, let alone spray it.

Rod

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RobertTX

01-29-2002 06:17:32




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 Re: Re: Re: Re: painting aluminum in reply to Rod (NH), 01-28-2002 21:25:11  
Rod(NH), I have to disagree with you about not adding the hardener. I tried that with some PPG acrylic enamel and the paint did not shine. Worse than that, it has no chemical resistance at all, oil or gasoline will soften it and it wipes off. Might be OK with some systems, but not that paint. Hope no one repeats my mistake.



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Rod (NH)

01-29-2002 10:18:24




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 Re: Re: Re: Re: Re: painting aluminum in reply to RobertTX, 01-29-2002 06:17:32  
Wow, what a bummer! I have never had a problem not using the hardener with either Delstar Acrylic Enamel by PPG or with Centari Acrylic Enamel by Dupont. These were, however, older formulations and the mix directions specifically permitted it. The automotive paint industry has undergone rapid changes in the last decade, many of which were forced by air emissions rules…particularly to lower volatile organic compounds (VOCs). It is my understanding that PPG no longer produces the Delstar line but has an acrylic enamel in their “second tier” lineup called “Omni” and is referred to as “MAE”. The cut sheets that I have for this product indicate use both with and without the associated hardener but I have no personal experience with it one way or the other. On the other hand, Dupont also has a “second tier” lineup called “Nason”. The acrylic enamel available here is referred to as “Ful-Cryl II”. I have cut sheets for that product that indicate the associated hardener (catalyst) IS REQUIRED for proper use. Go figure!

In any event, thanks for bringing that matter up. Excellent point to consider with the newer products available. It is extremely important to follow the label directions very carefully now-a-days and to read the fine print when it comes to safety instructions. If you don’t have the equipment to safely spray materials containing isocyanates, find another product...or use the much cheaper “old fashioned” tractor enamels available outside the modern automotive re-finish suppliers.

Rod

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